Power circuit, power control method, compound power circuit and electronic device

Abstract

A power circuit, a power control method, a compound power circuit and an electronic device are provided. The power circuit includes an inverter circuit for converting a first DC signal of the DC power source to a first AC signal, a resonant circuit for regulating the first AC signal, an isolation transformer for converting the regulated first AC signal to a second AC signal, a rectifier circuit for converting the second AC signal to a second DC signal and outputting the second DC signal to a load circuit, and a control circuit for generating a first control signal based on rise and/or drop of the first AC signal voltage and/or rise and/or drop of the second AC signal voltage; the rectifier circuit regulates the second DC signal based on the first control signal.

What is claimed is: 
     
         1 . A power circuit, comprising:
 an inverter circuit coupled with a DC power source to receive a first DC signal from the DC power source and convert the first DC signal to a first AC signal;   a resonant circuit coupled with the inverter circuit to receive and regulate the first AC signal from the inverter circuit;   an isolation transformer coupled with the resonant circuit to receive the regulated first AC signal from the resonant circuit and convert the regulated first AC signal to a second AC signal;   a rectifier circuit coupled with the isolation transformer and a load circuit to receive the second AC signal from the isolation transformer, convert the second AC signal to a second DC signal, and output the second DC signal to the load circuit; and   a control circuit coupled with the inverter circuit and the rectifier circuit to obtain at least one of the first AC signal or the second AC signal in the isolation transformer by sampling, and generate a first control signal based on at least one of rise or drop of the first AC signal voltage, or at least one of rise or drop of the second AC signal voltage, wherein   the rectifier circuit is configured to receive the first control signal and regulate the second DC signal based on the first control signal.   
     
     
         2 . The power circuit according to  claim 1 , wherein:
 the control circuit is configured to obtain the second DC signal in the rectifier circuit by sampling, compare the second DC signal with a preset power threshold to determine the signal frequency of a second control signal, and send the second control signal at the signal frequency; and   the inverter circuit is configured to receive the second control signal and regulate the first AC signal based on the second control signal.   
     
     
         3 . The power circuit according to  claim 2 , wherein:
 the inverter circuit further comprises a first switch sub-circuit and a second switch sub-circuit;   the first switch sub-circuit is coupled with the second switch sub-circuit, the resonant circuit, the isolation transformer, and the control circuit, and is coupled with the DC power source;   the second switch sub-circuit is coupled with the control circuit;   the second control signal comprises a first drive signal and a second drive signal;   the first switch sub-circuit is configured to receive the first drive signal to change a switch state of the first switch sub-circuit under an action of the first drive signal;   the second switch sub-circuit is configured to receive the second drive signal to change a switch state of the second switch sub-circuit under an action of the second drive signal to match with the switch state of the first switch sub-circuit, and regulate the first AC signal.   
     
     
         4 . The power circuit according to  claim 3 , wherein:
 the control circuit further comprises a sampling circuit, a signal processing circuit, and a drive circuit;   the sampling circuit is coupled with the isolation transformer and the signal processing circuit;   the signal processing circuit is coupled with the drive circuit, and   the drive circuit is coupled with the inverter circuit and the rectifier circuit;   the sampling circuit is configured to obtain at least one of the first AC signal or the second AC signal in the isolation transformer by sampling; and   the signal processing circuit is configured to receive at least one of the first AC signal or the second AC signal, control the drive circuit to change a level state of the first control signal by responding to at least one of rise or drop of the first AC signal voltage, or at least one of rise or drop of the second AC signal voltage, and send the first control signal to the rectifier circuit to trigger the rectifier circuit to change a switch state of the rectifier circuit and regulate the second DC signal.   
     
     
         5 . The power circuit according to  claim 4 , wherein:
 the control circuit further comprises a first proportional filtering correction circuit and a second proportional filtering correction circuit;   the sampling circuit further comprises a first sampling circuit and a second sampling circuit;   the first sampling circuit is coupled with the isolation transformer and the first proportional filtering correction circuit;   the second sampling circuit is coupled with the rectifier circuit and the second proportional filtering correction circuit;   the first sampling circuit is configured to obtain the first AC signal or the second AC signal in the isolation transformer by sampling;   the second sampling circuit is configured to obtain the second DC signal in the rectifier circuit by sampling;   the first proportional filtering correction circuit is configured to receive at least one of the first AC signal or the second AC signal, and send at least one of the first AC signal or the second AC signal to the signal processing circuit after comparison with reference value, filtration, and correction, so that the signal processing circuit is configured to control the drive circuit to generate the first control signal; and   the second proportional filtering correction circuit is configured to receive the second DC signal, and send the second DC signal to the signal processing circuit after comparison with reference value, filtration, and correction, so that the signal processing circuit is configured to control the drive circuit to generate the first drive signal and the second drive signal.   
     
     
         6 . The power circuit according to  claim 3 , wherein:
 the rectifier circuit further comprises a third switch sub-circuit and a fourth switch sub-circuit;   the isolation transformer further comprises a primary winding and a secondary winding;   the primary winding is coupled with the resonant circuit and the secondary winding;   the secondary winding is coupled with the third switch sub-circuit and the fourth switch sub-circuit;   the third switch sub-circuit is coupled with the fourth switch sub-circuit and the control circuit and is coupled with the load circuit;   the fourth switch sub-circuit is coupled with the control circuit;   the first control signal comprises a third drive signal and a fourth drive signal;   the primary winding is configured to receive the regulated first AC signal from the resonant circuit;   the secondary winding is configured to convert the first AC signal to the second AC signal, and send the second AC signal to the third switch sub-circuit and the fourth switch sub-circuit;   the first AC signal comprises the first voltage signals on both ends of the primary winding;   the second AC signal comprises the second voltage signals on both ends of the secondary winding;   the third switch sub-circuit is configured to receive the third drive signal from the control circuit;   the level state of the third drive signal is configured to be changed in rise and drop of the first voltage signal, or in rise and drop of the second voltage signal, to trigger the third switch sub-circuit to change a switch state of the third switch sub-circuit;   the fourth switch sub-circuit is configured to receive the fourth drive signal; and   the level state of the fourth drive signal is configured to be changed in rise and drop of the first voltage signal, or in rise and drop of the second voltage signal, to trigger the fourth switch sub-circuit to change a switch state of the fourth switch sub-circuit.   
     
     
         7 . The power circuit according to  claim 6 , wherein:
 the second AC signal further comprises a first current signal of the third switch sub-circuit and a second current signal of the fourth switch sub-circuit;   the control circuit is configured to regulate a first level state of the third drive signal to a second level state when at least one of the first voltage signal or the second voltage signal rises, and the control circuit is configured to regulate the second level state of the third drive signal to the first level state when at least one of the first voltage signal or the second voltage signal drops, or when the first current signal attenuates to 0 forward;   the control circuit is configured to regulate the first level state of the fourth drive signal to the second level state when at least one of the first voltage signal or the second voltage signal drops; and   the control circuit is configured to regulate the second level state of the fourth drive signal to the first level state when at least one of the first voltage signal or the second voltage signal rises, or when the second current signal attenuates to 0 forward.   
     
     
         8 . The power circuit according to  claim 7 , wherein:
 when the signal frequency is lower than the resonant frequency of the resonant circuit, the first drive signal is in the second level state, the second drive signal is in the first level state, the third drive signal is in the first level state, and the fourth drive signal is in the second level state; or   when the first drive signal is in the first level state, the second drive signal is in the second level state, the third drive signal is in the second level state, and the fourth drive signal is in the first level state,   wherein the phase of the third current of the resonant circuit remains unchanged.   
     
     
         9 . The power circuit according to  claim 3 , wherein:
 the first switch sub-circuit comprises a first switching tube and a fourth switching tube;   the second switch sub-circuit comprises a second switching tube and a third switching tube;   the first end of the first switching tube is coupled with the first end of the third switching tube and is coupled with the first end of the DC power source;   the second end of the first switching tube is coupled with the first end of the second switching tube and the first end of the resonant circuit;   the second end of the third switching tube is coupled with the first end of the fourth switching tube and the second end of the isolation transformer;   the second end of the second switching tube is coupled with the second end of the fourth switching tube and is coupled with the second end of the DC power source; and   the third ends of the first switching tube, the second switching tube, the third switching tube, and the fourth switching tube are coupled with the control output end of the control circuit; or   the first switch sub-circuit comprises a seventh switching tube;   the second switch sub-circuit comprises an eighth switching tube;   the first end of the seventh switching tube is coupled with the first end of the DC power source;   the second end of the seventh switching tube is coupled with the first end of the eighth switching tube and the first end of the resonant circuit;   the second end of the eighth switching tube is coupled with the second end of the isolation transformer and is coupled with the second end of the DC power source; and   the third end of the seventh switching tube and the third end of the eighth switching tube are coupled with the control output end of the control circuit.   
     
     
         10 . The power circuit according to  claim 6 , wherein:
 the secondary winding comprises a first sub secondary winding and a second sub secondary winding;   the third switch sub-circuit comprises a fifth switching tube;   the fourth switch sub-circuit comprises a sixth switching tube;   the first end of the first sub secondary winding is coupled with the first end of the fifth switching tube;   the second end of the first sub secondary winding is coupled with the second end of the second sub secondary winding and is coupled with the second end of the load circuit;   the first end of the second sub secondary winding is coupled with the first end of the sixth switching tube;   the second end of the fifth switching tube is coupled with the second end of the sixth switching tube and is coupled with the first end of the load circuit; and   the third end of the fifth switching tube and the third end of the sixth switching tube are coupled with the control output end of the control circuit; or   the third switch sub-circuit comprises a ninth switching tube and a twelfth switching tube;   the fourth switch sub-circuit comprises a tenth switching tube and an eleventh switching tube;   the first end of the secondary winding is coupled with the first end of the ninth switching tube and the second end of the tenth switching tube;   the second end of the secondary winding is coupled with the first end of the eleventh switching tube and the second end of the twelfth switching tube;   the second end of the ninth switching tube is coupled with the second end of the eleventh switching tube and is coupled with the first end of the load circuit;   the first end of the tenth switching tube is coupled with the first end of the twelfth switching tube and is coupled with the second end of the load circuit; and   the third ends of the ninth switching tube, the tenth switching tube, the eleventh switching tube, and the twelfth switching tube are coupled with the control output end of the control circuit.   
     
     
         11 . A power control method, comprising:
 receiving a first DC signal from a DC power source;   converting the first DC signal to a first AC signal;   regulating the first AC signal;   converting the regulated first AC signal to a second AC signal;   converting the second AC signal to a second DC signal and outputting the second DC signal to a load circuit;   generating a first control signal based on at least one of rise or drop of a regulated first AC signal voltage, or at least one of rise or drop of a second AC signal voltage; and   regulating the second DC signal based on the first control signal.   
     
     
         12 . The power control method according to  claim 11 , wherein the converting the second AC signal to the second DC signal and outputting the second DC signal to the load circuit further comprises:
 comparing the second DC signal with a preset power threshold to determine a signal frequency of a second control signal; and   regulating the first AC signal based on the second control signal.   
     
     
         13 . The power control method according to  claim 11 , wherein:
 the first control signal comprises a third drive signal and a fourth drive signal;   the second AC signal comprises a first voltage signal, a second voltage signal, a first current signal, and a second current signal;   the generating the first control signal based on at least one of rise or drop of the regulated first AC signal voltage, or at least one of rise or drop of the second AC signal voltage further comprises:
 regulating a first level state of the third drive signal to a second level state when at least one of the first voltage signal or the second voltage signal rises; 
 regulating the second level state of the third drive signal to the first level state when at least one of the first voltage signal or the second voltage signal drops, or when the first current signal attenuates to 0 forward; 
 regulating the first level state of the fourth drive signal to the second level state when at least one of the first voltage signal or the second voltage signal drops; and 
 regulating the second level state of the fourth drive signal to the first level state when at least one of the first voltage signal or the second voltage signal rises, or when the second current signal attenuates to 0 forward. 
   
     
     
         14 . A compound power circuit, comprising:
 a DC power source; and   at least two power circuits which are in series or parallel connection and are coupled with the DC power source,   wherein the power circuit comprises:
 an inverter circuit coupled with the DC power source to receive a first DC signal from the DC power source and convert the first DC signal to a first AC signal; 
 a resonant circuit coupled with the inverter circuit to receive and regulate the first AC signal from the inverter circuit; 
 an isolation transformer coupled with the resonant circuit to receive the regulated first AC signal from the resonant circuit and convert the regulated first AC signal to a second AC signal; 
 a rectifier circuit coupled with the isolation transformer and a load circuit to receive the second AC signal from the isolation transformer, convert the second AC signal to a second DC signal, and output the second DC signal to the load circuit; and 
 a control circuit coupled with the inverter circuit and the rectifier circuit to obtain at least one of the first AC signal or the second AC signal in the isolation transformer by sampling, and generate a first control signal based on at least one of rise or drop of the first AC signal voltage, or at least one of rise or drop of the second AC signal voltage, 
 wherein the rectifier circuit is configured to receive the first control signal and regulate the second DC signal based on the first control signal. 
   
     
     
         15 . An electronic device, comprising:
 a shell; and   a power circuit or a compound power circuit connected with the shell,   wherein the power circuit comprises:
 an inverter circuit coupled with a DC power source to receive a first DC signal from the DC power source and convert the first DC signal to a first AC signal; 
 a resonant circuit coupled with the inverter circuit to receive and regulate the first AC signal from the inverter circuit; 
 an isolation transformer coupled with the resonant circuit to receive the regulated first AC signal from the resonant circuit and convert the regulated first AC signal to a second AC signal; 
 a rectifier circuit coupled with the isolation transformer and a load circuit to receive the second AC signal from the isolation transformer, convert the second AC signal to a second DC signal, and output the second DC signal to the load circuit; and 
 a control circuit coupled with the inverter circuit and the rectifier circuit to obtain at least one of the first AC signal or the second AC signal in the isolation transformer by sampling, and generate a first control signal based on at least one of rise or drop of the first AC signal voltage, or at least one of rise or drop of the second AC signal voltage, 
 wherein the rectifier circuit is configured to receive the first control signal and regulate the second DC signal based on the first control signal; and 
 wherein the compound power circuit comprises:
 the DC power source; and 
 at least two of the power circuits which are in series or parallel connection and are coupled with the DC power source.